fix Style/EmptyLiteral issue

Change-Id: I8417d2abf3e2d3e01b691df553c79026801f6bce
fixes: CNVS-20009
Reviewed-on: https://gerrit.instructure.com/52920
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Strand McCutchen <smccutchen@instructure.com>
QA-Review: Strand McCutchen <smccutchen@instructure.com>

app/models/context.rb

@@ -141,7 +141,7 @@ module Context
       ids_by_type[type] += [id]
     end
 
-    result = Hash.new
+    result = {}
     ids_by_type.each do |type, ids|
       klass = Object.const_get(type, false)
       klass.where(:id => ids).select([:id, :name]).map {|c| result[[type, c.id]] = c.name}

gems/autoextend/lib/autoextend.rb

@@ -10,7 +10,7 @@ module Autoextend
   end
 
   def self.extensions
-    @extensions ||= Hash.new
+    @extensions ||= {}
   end
 
   MethodExtension = Struct.new(:target, :feature) do
@@ -87,11 +87,11 @@ module Autoextend
     end
 
     def autoextensions
-      @autoextensions ||= Hash.new
+      @autoextensions ||= {}
     end
 
     def singleton_autoextensions
-      @autoextensions ||= Hash.new
+      @autoextensions ||= {}
     end
 
     def autoextend_singleton(method, feature)

gems/workflow/lib/workflow.rb

@@ -31,7 +31,7 @@ module Workflow
     attr_accessor :states, :initial_state, :on_transition_proc
     
     def initialize
-      @states = Hash.new
+      @states = {}
     end
 
     def add(&specification)
@@ -85,7 +85,7 @@ module Workflow
     attr_accessor :name, :events, :on_entry, :on_exit
     
     def initialize(name)
-      @name, @events = name, Hash.new
+      @name, @events = name, {}
     end
     
     def to_s

lib/api/v1/gradebook_history.rb

@@ -20,7 +20,7 @@ module Api::V1
 
     def json_for_date(date, course, api_context)
       submissions_set(course, api_context, :date => date).
-        each_with_object(Hash.new) { |sub, memo| update_graders_hash(memo, sub, api_context) }.values.
+        each_with_object({}) { |sub, memo| update_graders_hash(memo, sub, api_context) }.values.
         each { |grader| compress(grader, :assignments) }
     end